package com.sky.service.impl;

import com.sky.annotion.AutoFill;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

@Slf4j
@Service
public class shoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        判断当前加入到购物车商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
//        若已存在，把数量加+1
        if(list!=null&&list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
//        若不存在。把这条数据插入到数据库
//         判断本次添加到购物车的是菜品还是套餐
            final Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
//                本次添加到购物车是菜品
                final Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //本次添加到购物车是套餐
                final Long setmealId = shoppingCartDTO.getSetmealId();
                final Setmeal setmeal = setmealMapper.getBy(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.addshopcart(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        final Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart =ShoppingCart
                .builder()
                .userId(userId)
                .build();
        final List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    @Override
    public void cleanCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.cleanCart(userId);
    }

    /**
     * 删除购物车某商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
//        查询当前用户的购物车内容
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        if(list!=null&&list.size()>0){
            ShoppingCart cart=list.get(0);
//        购物车商品数量
        Integer number=cart.getNumber();
//        如果数量为1，直接根据id删除该商品
        if(number==1){
            shoppingCartMapper.deleteById(cart.getId());
        }else {
//            否则，让其数量减1
            cart.setNumber(cart.getNumber()-1);
            shoppingCartMapper.updateNumberById(cart);
            }
        }
    }
}
